KOHLER San Raphael Comfort Height 1-piece 1 GPF Single Flush Elongated Toilet in Biscuit. I replaced a clunky old toilet from 1982 which consumed 5-6 gallons per use. Glacier Bay Power Flush 2 Piece 1 28 Gpf Single Flush Elongated Toilet In White With Slow Close Seat Included N2450e The Home Depot Glacier Bay Flush Tall Toilets A pressure-assisted toilet uses a secondary tank located in its main toilet tank to create additional air pressure to aid toilet flushing while maintaining more water in the toilet bowl. Pressure assist toilet review . Before buying be sure that your home has at least 25 pounds per square inch of water. 30 - 35. The Gerber Pressure-Assist flushing system found in the Ultra Flush range uses pressurized air from a pressure vessel in tandem with water to create a. Gerber Pressure Assist Toilet. Among the options for pressure-assisted toilets youll find both one-piece and two-piece toilets as well as low-flow options for water savings. Less than 15 in. ...